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• Use “ “ for phrases o [ “pediatric abdominal pain” ] • Use – to remove results with certain terms o [ “abdominal pain” –pediatric ] • Use OR to account for alternate terms o [teenager OR adolescent ]
正常情况下，跑步时膝盖骨（髌骨）在股骨上下移动。大腿肌肉力量减弱或足部过于内转（内旋）时，患者可感觉膝盖疼痛。因此，膝盖骨在股骨上不正常摩擦，导致磨损加重。
